CN101954550B - Overlaying welding wire for defects of casted two phase stainless steel 1A - Google Patents
Overlaying welding wire for defects of casted two phase stainless steel 1A Download PDFInfo
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Abstract
The invention relates to an overlaying welding wire for defects of casted two phase stainless steel 1A. The two phase stainless steel 1A is 25 Cr-5Ni-Mo-Cu (1A). The overlaying welding wire comprises the following basic components: less than or equal to 0.04 percent of carbon, less than or equal to 0.7 percent of silicon, less than or equal to 0.7 percent of manganese, 25.0 to 25.5 percent of chromium, 1.75 to 1.95 percent of molybdenum, 2.75 to 2.95 percent of copper, less than 0.08 percent of other inevitable impurities and elements and the balance of ferrum. The overlaying welding wire also comprises the basic components of more than 6.0 to 6.5 percent of nickel and 0.06 to 0.1 percent of nitrogen. The overlaying welding wire of which the diameter is 2 millimeters is formed finally by refining, hot forging, multi-pass cold drawing and annealing, so the performance of erosion corrosion resistance and cavitation erosion resistance of the 25 Cr-5Ni-Mo-Cu (1A) is met, and the overlaying welding position of the defects of the casted 25 Cr-5Ni-Mo-Cu (1A) has the excellent performance of erosion corrosion resistance and cavitation erosion resistance.
Description
Technical field
The invention belongs to technical field of welding materials, especially a kind of repair welding welding wire that is exclusively used in two phase stainless steel 1A casting back defective, this two phase stainless steel 1A refers in particular to into 25Cr-5Ni-Mo-Cu (1A) in the present invention.
Background technology
25Cr-5Ni-Mo-Cu (1A) is wherein a kind of material in the two phase stainless steel type just; Its ferritic phase almost respectively accounts for half the with austenite mutually in the tissue of this material; Therefore the characteristics of the existing austenitic stainless steel of 25Cr-5Ni-Mo-Cu (1A) have the characteristics of ferritic stainless steel again; Plasticity and the toughness of comparing 25Cr-5Ni-Mo-Cu (1A) with ferritic stainless steel are higher, do not have room temperature fragility, and intergranular corrosion resistance performance and welding performance are significantly increased; The 475 ℃ of fragility and the thermal conductivity factor that also maintain ferritic stainless steel simultaneously are high, have characteristics such as superplasticity.Compare between the high and anti-article of the intensity of 25Cr-5Ni-Mo-Cu (1A) corrosion corrodes with anti-chloride stress cracking and is significantly improved with austenitic stainless steel.
According to U.S. ASTM-A890 " general purpose Fe-Cr-Ni-Mo base anti-corrosion two-phase (austenite/ferrite) stainless cast steel part standard criterion ", the chemical composition content of 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel (1A in the bracket is its corresponding grades trade mark) see the following form (wt%):
The erosion corrosion speed following table of 25Cr-5Ni-Mo-Cu (1A): (unit: the every square meter of milligram per hour)
The cavitation damage speed of 25Cr-5Ni-Mo-Cu (1A) sees the following form: (unit: per hour restrain every square meter)
Because 25Cr-5Ni-Mo-Cu (1A) has excellent anti-erosion corrosion and cavitation-corrosion-resistant performance; Application in pump valve class foundry goods is very extensive; Range of application is also very wide abroad; As on naval vessels as spiral propeller, like ocean industrial aspect such as oil fields at sea as axial-flow pump, axle, high-pressure pump or seawater jet pump etc.
5Cr-5Ni-Mo-Cu (1A) generally adopts casting to produce foundry goods; Foundry goods inevitably can produce casting flaw usually for this reason; It is a part very important in the pump housing castings production that casting flaw is carried out Welding Repair; And Welding Repair it is highly important that the repair welding material chosen except having the rational welding, and repair welding material mistake or underproof will directly cause scrapping of former parts.
Because it is shorter that 25Cr-5Ni-Mo-Cu (1A) gets into the time of standard, on China market, also be not used in the repair welding material of casting 25Cr-5Ni-Mo-Cu (1A) at present, Foundry Production producer adopts other wlding to replace usually.Because the mother metal composition of other wlding and 25Cr-5Ni-Mo-Cu (1A) does not match; Therefore cause casting flaw position its mis-behave after Welding Repair; The anti-erosion corrosion performance and the cavitation-corrosion-resistant performance of 25Cr-5Ni-Mo-Cu (1A) have been reduced; The waster rate is high, has limited the application of 25Cr-5Ni-Mo-Cu (1A) on pump valve class foundry goods greatly, and the waste of generation is great.
Summary of the invention
For addressing the above problem; The invention provides a kind of repair welding welding wire that is exclusively used in two phase stainless steel 1A casting back defective; This repair welding welding wire only is used for the repair welding of 25Cr-5Ni-Mo-Cu (1A) casting back defective; It is low to have welding cost with respect to present alternative repair welding material, and welding process is reliable and stable, the repair welding position near or be superior to the anti-erosion corrosion performance and the cavitation-corrosion-resistant performance of mother metal; The repair welding position that has guaranteed 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel casting back defective has good anti-erosion corrosion and cavitation-corrosion-resistant performance, has improved the utilization rate of 25Cr-5Ni-Mo-Cu (1A) cast member.
In order to realize the foregoing invention purpose, the present invention has adopted following technical scheme:
The said repair welding welding wire that is used for two phase stainless steel 1A casting back defective, said two phase stainless steel 1A is meant 25Cr-5Ni-Mo-Cu (1A), the basic chemical composition of this repair welding welding wire is constructed as follows by weight percentage:
Carbon≤0.04%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-25.5%, molybdenum 1.75-1.95%, copper 2.75-2.95%, other unavoidable impurities and element＜0.08% and balance iron;
Characteristic of the present invention is in above-mentioned said basic chemical composition, also to be added with＞nickel of 6.0-6.5% and the nitrogen of 0.06-0.1%, and the repair welding welding wire that adds nickel and nitrogen always is constructed as follows by weight percentage:
Carbon≤0.04%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-25.5%, nickel＞6.0-6.5%, nitrogen 0.06-0.1%, molybdenum 1.75-1.95%, copper 2.75-2.95%, other unavoidable impurities and element＜0.08% and balance iron.
By above-mentioned total formation proportioning prepare burden the back and adopt the argon-oxygen-decarburizing process refining to go out repair welding welding wire ingot casting; Said refining process is under normal atmospheric pressure, to carry out and be blown into oxygen, argon gas and nitrogen; Forge hot when said repair welding welding wire ingot casting is heated to 900 ℃-1150 ℃ afterwards; After the forge hot repair welding welding wire ingot casting is carried out the surface finish cleaning, be rolled into the repair welding welding wire pole of φ 6mm when being heated to 1000 ℃-1150 ℃ again, afterwards said repair welding welding wire pole is carried out the cold drawn of multi-pass and annealing; The final repair welding welding wire that forms φ 2mm, the mechanical property of said repair welding welding wire should satisfy:
1. fracture strength R
m(MPa)>=690;
2. yield strength R
P0.2(MPa)>=485;
3. contraction percentage of area A (%) >=16.
The said repair welding welding wire that satisfies mechanical property in the repair welding that is exclusively used in casting 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel casting back defective is:
Welding current is controlled between the 120-160A, and weldingvoltage is controlled between the 22-30V, if multi-pass welding then the temperature between key-course in 150 ℃.
Owing to adopted aforesaid technical scheme, the present invention has following superiority:
1, the constituent ratio of the basic chemical composition of repair welding welding wire of the present invention and 25Cr-5Ni-Mo-Cu (1A) is more approaching, but total formation one of repair welding welding wire of the present invention is the content ratio that has improved nickel, and the 2nd, added the nitrogen element.New nitrogen that adds and the content ratio that improves nickel simultaneously can guarantee that the welding position austenite is mutually easier in welding process and separate out, reaching ferritic phase and austenite proper ratio mutually, thus the institutional framework of the complete two-phase coexistent in assurance welding position.
2, total formation of repair welding welding wire of the present invention and 25Cr-5Ni-Mo-Cu (1A) two-phase stainless steel chemical composition and phase structure are complementary; Therefore can satisfy the anti-erosion corrosion performance and the cavitation-corrosion-resistant performance of 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel as the repair welding welding wire; The repair welding position that has guaranteed 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel casting back defective has good anti-erosion corrosion performance and cavitation-corrosion-resistant performance; Improve the service efficiency of 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel cast member, practiced thrift mass energy.
3, repair welding welding wire cost of manufacture of the present invention is low, welding process is reliable and stable, the welding position near or be superior to 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel.
4, repair welding welding wire of the present invention is through detecting; The ratio of its austenite and ferritic phase is near 50%; Through anti-erosion corrosion and the cavitation-corrosion-resistant Performance Detection to the welding position, the performance of its anti-erosion corrosion and cavitation-corrosion-resistant quite or be superior to mother metal 25Cr-5Ni-Mo-Cu (1A).
5, adopt repair welding welding wire of the present invention, reduced the reparation defect rate of 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel cast member, practiced thrift the energy and resource.
6, use repair welding welding wire of the present invention, its welding procedure is simple and practical.
The specific embodiment
The present invention is a kind of repair welding welding wire that is exclusively used in two phase stainless steel 1A casting back defective; Said two phase stainless steel 1A specially refers to this a kind of alloy designations of 25Cr-5Ni-Mo-Cu (1A), and said repair welding welding wire only is used for the Welding Repair welding wire of 25Cr-5Ni-Mo-Cu (1A) casting back defective.
The basic chemical composition of said repair welding welding wire is constructed as follows by weight percentage:
Carbon≤0.04%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-25.5%, molybdenum 1.75-1.95%, copper 2.75-2.95%, other unavoidable impurities and element (like phosphorus, sulphur, nickel etc.)＜0.08% and balance iron.
In above-mentioned said basic chemical composition, also be added with＞nickel of 6.0-6.5% and the nitrogen of 0.06-0.1%, the repair welding welding wire that adds nickel and nitrogen always is constructed as follows by weight percentage:
Carbon≤0.04%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-25.5%, nickel＞6.0-6.5%, nitrogen 0.06-0.1%, molybdenum 1.75-1.95%, copper 2.75-2.95%, other unavoidable impurities and element (like phosphorus, sulphur etc.)＜0.08% and balance iron.
New nitrogen that adds and the content ratio that improves nickel simultaneously from weld characteristics analyze mainly based on following some:
The one, two phase stainless steel belongs to ferrite in welding process and solidifies pattern; Promptly a solidifying phase is single-phase ferrite; When weld metal is cooled to room temperature from fusing point, separate out austenite, thereby obtain two-phase structure's structure of welding position ferrite and austenite coexistence from ferrite matrix.Two phase stainless steel inappropriate welding material in welding process can cause the welding point ferrite content too high; Thereby cause the embrittlement of welding position; It has been generally acknowledged that at the two phase stainless steel welding field at present keeps the austenitic advantage content in welding point position more to help improving the performance of weld seam; N, Ni are strong austenite formers; The content that the repair welding material that is used for casting two phase stainless steel is new to improve nickel when adding nitrogen can guarantee that the welding position austenite is mutually easier in welding process and separate out, reaching ferritic phase and austenite proper ratio mutually, thus the institutional framework of the complete two-phase coexistent in assurance welding position.
The 2nd, add anti-spot corrosion and crevice corrosion behavior that nitrogen has improved the welding position; And nitrogen can reduce stacking fault energy and improve the work hardening rate of austenite phase in the two phase stainless steel duplex structure in the microstructure of two phase stainless steel, and it has also improved austenitic intensity through solution strengthening.
By above-mentioned total formation proportioning prepare burden the back and adopt argon-oxygen-decarburizing process (being the AOD purifying method) refining to go out repair welding welding wire ingot casting; Said refining process major control be the content ratio of Cr, Ni or N because the content ratio of Cr, Ni or N has directly determined the phase ratio at repair welding position.Under normal atmospheric pressure to oxygen blown inert gas argon gas Ar and the nitrogen 5N of being blown into simultaneously of molten steel
2, through reducing carbon monoxide (CO) thus dividing potential drop make carbon content drop to very low level, guaranteed that the repair welding component of weld wire is in the scope of being controlled.Be prone to compound between precipitating metal when heating in 300 ℃ of-800 ℃ of scopes owing to 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel cast member in addition; So forge hot when said repair welding welding wire ingot casting is heated to 900 ℃-1150 ℃; After the forge hot repair welding welding wire ingot casting is carried out the surface finish cleaning to surperficial flawless; Be rolled into the repair welding welding wire pole of φ 6mm when being heated to 1000 ℃-1150 ℃ again; Afterwards said repair welding welding wire pole is carried out the cold drawn of multi-pass and annealing, finally form the repair welding welding wire of φ 2mm, the mechanical property of said repair welding welding wire welding wire should satisfy:
1. fracture strength R
m(MPa)>=690;
2. yield strength R
P0.2(MPa)>=485;
3. contraction percentage of area A (%) >=16.
The said repair welding welding wire that satisfies mechanical property in the repair welding that is exclusively used in casting 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel casting back defective is:
Welding current is controlled between the 120-160A, and weldingvoltage is controlled between the 22-30V, if multi-pass welding then the temperature between key-course in 150 ℃.
In conjunction with following three specific embodiments the present invention is explained:
Embodiment one: repair welding welding wire of the present invention always constitutes by weight percentage and sees the following form.
| Fe | Cr | Ni | N | Mo | Cu | C | Si | Mn | Other |
| 63.23 | 25.0 | 6.01 | 0.06 | 1.75 | 2.75 | 0.03 | 0.6 | 0.5 | 0.07 |
According to prepare burden back and finally formed the repair welding welding wire of φ 2mm according to above-mentioned preparation method of last table, this repair welding welding wire satisfies fracture strength, yield strength and contraction percentage of area mechanical performance index.
Concrete welding parameter sees the following form:
| Welding current (A) | Weldingvoltage (V) | Interlayer temperature (℃) |
| 140 | 25 | 90 |
A complete Welding Repair position comprises weld seam and heat affected area, usually two phase stainless steel Welding Repair position is comprised that the ferrite content of weld seam, heat affected area and matrix all measures, more comprehensively to confirm the phase ratio at the multiple position of portion's repair welding.Adopt repair welding welding wire of the present invention after repairing 25Cr-5Ni-Mo-Cu (1A) two-phase stainless cast member, the ferritic phase phase ratio (percentage) at Welding Repair position to be measured the result between 40%-60%, meet universally recognized two phase stainless steel ferritic phase proportion requirement.
| The ferrite percentage of weld metal zone, Welding Repair position | 40.43％ |
| The ferrite percentage of heat affected area, Welding Repair position | 59.11％ |
| The ferrite percentage of mother metal | 56.78％ |
The erosion corrosion speed at Welding Repair position (unit: the every square meter of milligram per hour) is measured the result with cavitation damage speed (unit: per hour restrain every square meter) to be shown: erosion corrosion speed and cavitation damage speed are all less than mother metal (mother metal refers to 25Cr-5Ni-Mo-Cu (1A) two phase stainless steel, under together) and be lower than the upper limit of 25Cr-5Ni-Mo-Cu (1A) erosion corrosion speed and the upper limit of cavitation damage speed.
| Erosion corrosion speed (the mgm at Welding Repair position -2h -1) | Mother metal erosion corrosion speed (mgm -2h -1) |
| 7.9 | 8.06 |
| Cavitation damage speed (the gm at Welding Repair position -2h -1) | Mother metal cavitation damage speed (gm -2h -1) |
| 0.1 | 0.114 |
Embodiment two: repair welding welding wire of the present invention always constitutes by weight percentage and sees the following form.
| Fe | Cr | Ni | N | Mo | Cu | C | Si | Mn | Other |
| 62.82 | 25.3 | 6.25 | 0.08 | 1.80 | 2.80 | 0.03 | 0.5 | 0.4 | 0.02 |
According to prepare burden back and finally formed the repair welding welding wire of φ 2mm according to above-mentioned preparation method of last table, this repair welding welding wire satisfies fracture strength, yield strength and contraction percentage of area mechanical performance index.
Concrete welding parameter is following:
| Welding current (A) | Weldingvoltage (V) | Interlayer temperature (℃) |
| 120 | 25 | 90 |
A complete Welding Repair position comprises weld seam and heat affected area, usually two phase stainless steel Welding Repair position is comprised that the ferrite content of weld seam, heat affected area and matrix all measures, more comprehensively to confirm the phase ratio at Welding Repair position.Adopt repair welding welding wire of the present invention after repairing 25Cr-5Ni-Mo-Cu (1A) two-phase stainless cast member, the ferritic phase phase ratio (percentage) at Welding Repair position to be measured the result between 40%-60%, meet universally recognized two phase stainless steel ferritic phase proportion requirement.
| The ferrite percentage of weld metal zone, Welding Repair position | 45.68％ |
| The ferrite percentage of heat affected area, Welding Repair position | 48.77％ |
| The ferrite percentage of mother metal | 51.13％ |
The erosion corrosion speed at Welding Repair position (unit: the every square meter of milligram per hour) is measured result's demonstration with cavitation damage speed (unit: per hour restrain every square meter): erosion corrosion speed and cavitation damage speed are all less than mother metal and be lower than the upper limit of 25Cr-5Ni-Mo-Cu (1A) erosion corrosion speed and the upper limit of cavitation damage speed.
| Erosion corrosion speed (the mgm at Welding Repair position -2h -1) | Mother metal erosion corrosion speed (mgm -2h -1) |
| 6.64 | 8.00 |
| Cavitation damage speed (the gm at Welding Repair position -2h -1) | Mother metal cavitation damage speed (gm -2h -1) |
| 0.08 | 0.10 |
Embodiment three repair welding welding wires of the present invention always constitute by weight percentage and see the following form.
| Fe | Cr | Ni | N | Mo | Cu | C | Si | Mn | Other |
| 62.02 | 25.5 | 6.5 | 0.1 | 1.95 | 2.95 | 0.02 | 0.4 | 0.5 | 0.06 |
According to prepare burden back and finally formed the repair welding welding wire of φ 2mm according to above-mentioned preparation method of last table, this repair welding welding wire satisfies fracture strength, yield strength and contraction percentage of area mechanical performance index.
Concrete welding parameter is following:
| Welding current (A) | Weldingvoltage (V) | Interlayer temperature (℃) |
| 130 | 26 | 80 |
A complete Welding Repair position comprises weld seam and heat affected area, usually two phase stainless steel Welding Repair position is comprised that the ferrite content of weld seam, heat affected area and matrix all measures, more comprehensively to confirm the phase ratio at Welding Repair position.Adopt repair welding welding wire of the present invention after repairing 25Cr-5Ni-Mo-Cu (1A) two-phase stainless cast member, the ferritic phase phase ratio (percentage) at Welding Repair position to be measured the result between 40%-60%, meet universally recognized two phase stainless steel ferritic phase proportion requirement.
| The ferrite percentage at Welding Repair position | 48.31％ |
| The ferrite percentage of heat affected area, Welding Repair position | 53.74％ |
| The ferrite percentage of mother metal | 48.75％ |
The erosion corrosion speed at Welding Repair position (unit: the every square meter of milligram per hour) is measured result's demonstration with cavitation damage speed (unit: per hour restrain every square meter): erosion corrosion speed and cavitation damage speed are all less than mother metal and be lower than the upper limit of 25Cr-5Ni-Mo-Cu (1A) erosion corrosion speed and the upper limit of cavitation damage speed.
| Erosion corrosion speed (the mgm at Welding Repair position -2h -1) | Mother metal erosion corrosion speed (mgm -2h -1) |
| 5.51 | 7.82 |
| Cavitation damage speed (the gm at Welding Repair position -2h -1) | Mother metal cavitation damage speed (gm -2h -1) |
| 0.07 | 0.97 |
Claims (1)
1. one kind is used for the repair welding welding wire that two phase stainless steel 1A casts the back defective, and said two phase stainless steel 1A is meant 25Cr-5Ni-Mo-Cu, and the basic chemical composition of this repair welding welding wire is constructed as follows by weight percentage:
Carbon≤0.04%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-25.5%, molybdenum 1.75-1.95%, copper 2.75-2.95%, other unavoidable impurities and element＜0.08% and balance iron;
It is characterized in that: the nitrogen that in above-mentioned said basic chemical composition, also is added with 6.0%＜nickel≤6.5% and 0.06-0.1%;
Under above-mentioned total formation proportioning, prepare burden and adopt the argon-oxygen-decarburizing process refining to go out repair welding welding wire ingot casting; Said refining process is under normal atmospheric pressure, to carry out and be blown into oxygen, argon gas and nitrogen; Forge hot when said repair welding welding wire ingot casting is heated to 900 ℃-1150 ℃ afterwards; After the forge hot repair welding welding wire ingot casting is carried out the surface finish cleaning, be rolled into the repair welding welding wire pole of φ 6mm when being heated to 1000 ℃-1150 ℃ again, afterwards said repair welding welding wire pole is carried out the cold drawn of multi-pass and annealing; The final repair welding welding wire that forms φ 2mm, the mechanical property of said repair welding welding wire should satisfy:
1. fracture strength R
m>=690MPa;
2. yield strength R
P0.2>=485MPa;
3. contraction percentage of area A >=16%.
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|---|---|---|---|
| CN 201010298591 CN101954550B (en) | 2010-10-08 | 2010-10-08 | Overlaying welding wire for defects of casted two phase stainless steel 1A |
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| CN101954550B true CN101954550B (en) | 2012-08-29 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0073896A2 (en) * | 1981-09-09 | 1983-03-16 | Messer Griesheim Gmbh | Method of welding workpieces of ferritic-austenitic steel |
| CN1125965A (en) * | 1993-06-21 | 1996-07-03 | 桑德维克公司 | Ferritic-austenitic stainless steel and use of the steel |
| CN101164731A (en) * | 2006-10-20 | 2008-04-23 | 基斯韦尔株式会社 | Flux cored wire for duplex stainless steel and method of manufacturing the same |
-
2010
- 2010-10-08 CN CN 201010298591 patent/CN101954550B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0073896A2 (en) * | 1981-09-09 | 1983-03-16 | Messer Griesheim Gmbh | Method of welding workpieces of ferritic-austenitic steel |
| CN1125965A (en) * | 1993-06-21 | 1996-07-03 | 桑德维克公司 | Ferritic-austenitic stainless steel and use of the steel |
| CN101164731A (en) * | 2006-10-20 | 2008-04-23 | 基斯韦尔株式会社 | Flux cored wire for duplex stainless steel and method of manufacturing the same |
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| CN101954550A (en) | 2011-01-26 |
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Address after: 471000 No. 32 Binhe Road, high tech Zone, Luoyang City, Henan Province Patentee after: CSSC Shuangrui (Luoyang) special equipment Co.,Ltd. Address before: 471000 No. 32 Binhe Road, high tech Zone, Luoyang City, Henan Province Patentee before: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. |